Since Froggy's birthday is February 29th, he only gets to celebrate it once every four years. As a result, he always cries when he attends other kids' birthday parties. The gang decides to throw him a surprise party to cheer him up. Froggy overhears their plans, but misunderstands and think he's being left out for being a sourpuss. He disguises himself as a girl and attends the party after booby trapping everything. When he learns that the party is actually for him, he makes sure he's the victim of all the pranks.
